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Proceedings Paper

Some practical aspects of long gauge block calibration
Author(s): Alessandro Balsamo; Marco Zangirolami
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Paper Abstract

This paper deals with some practical aspects of the calibration of long gauge blocks. Particular attention is given to the thermal aspects of the calibration, including the in situ calibration of the thermometers according to the ITS-90, the procedure which frees from the need of external traceability to electrical SI units, the optimal disposition of the thermometers on the gauge block, and the clamping technique which prevents distortion of the gauge and minimizes the probability of mechanical shocks to the thermometers. Experimental data are reported which shows a sub-millikelvin uniformity of the gauge block. The stress- free gauge block supports are also descried, optimized to compensate for the bending due to the weight of the platen wrung to the block end, to allow accurate face parallelism measurements. The procedures for measuring the deviation from planarity and the variation of length are described, which implement the ISO 3650 definitions with no approximate image processing of the interferograms.

Paper Details

Date Published: 30 September 1998
PDF: 10 pages
Proc. SPIE 3477, Recent Developments in Optical Gauge Block Metrology, (30 September 1998); doi: 10.1117/12.323115
Show Author Affiliations
Alessandro Balsamo, Istituto di Metrologia G. Colonnetti (Italy)
Marco Zangirolami, Istituto di Metrologia G. Colonnetti (Italy)

Published in SPIE Proceedings Vol. 3477:
Recent Developments in Optical Gauge Block Metrology
Jennifer E. Decker; Nicholas Brown, Editor(s)

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